Merge "Removed unwanted shadow in restart and letterbox education dialogs"...

Merge "Removed unwanted shadow in restart and letterbox education dialogs" into tm-qpr-dev am: e20f8164 am: a1e7c32e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21408602



Change-Id: I205b3858824148581cd1bbea400aa16f43db070d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>